Finding the right inductance value—and peak current rating—for your SMPS converter can be a bit of a hassle. So here’s a little tool to help you! Simply use this calculator, which’ll calculate all the parameters you need to factor in. The calculator supports the common, simple topologies: Boost (stepup), Buck (stepdown) and Buckboost (inversion – positive to negative).
Input values  Output values 

For prefixes, use scientific notation.
SI prefixes and the associated exponents are:
nano: e9
For instance, 100 mA should be written as 100e3 in the input field. 
Switching topology N/A

V
V
A
%
KHz
V

Peak inductor current N/A
Ripple current (lower bound) N/A
Ripple current (upper bound) N/A
Inductance value range N/A
